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(11)

EP 4 078 920 A1

(12)

(43) Date of publication: 26.10.2022 Bulletin 2022/43 (21) Application number: 20834096.8 (22) Date of filing: 10.12.2020

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) H04W 12/033(2021.01) H04W 28/02(2009.01) H04W 12/08(2021.01) (52) Cooperative Patent Classification (CPC): H04L 63/0272; H04W 28/0268; H04W 12/033; H04W 12/08; H04L 47/20 (86) International application number: PCT/US2020/064175 (87) International publication number: WO 2021/126649 (24.06.2021 Gazette 2021/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 17.12.2019 US 201916717384 (71) Applicant: Cisco Technology, Inc. San Jose, CA 95134 (US)

(72) Inventors: SAMUEL, Louis, Gwyn Swindon, Wiltshire SN5 5DQ (GB) GUNDAVELLI, Srinath San Jose, CA 95135 (US) BULL, Oliver, James Bristol BS20 7NJ (GB) GRAYSON, Mark Maidenhead, Berkshire SL6 4NZ (GB) LAKKARAJU, Sangram, Kishore Bangalore 560087 (IN) MURTHY, Shree, N. San Jose, CA 95129 (US) (74) Representative: Noble, Nicholas et al Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)